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Goodwill and Core Deposit Intangibles - Schedule of Future Estimated CDI Amortization Expense (Details) - Core Deposits Intangibles - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]        
2018 $ 6.9      
2019 6.6      
2020 6.2      
2021 5.7      
2022 5.3      
Thereafter 18.4      
Total $ 49.1 $ 9.7 $ 10.6 $ 13.3